Xinhua News Agency, Tianjin, February 13 (Reporter Zhou Runjian) February 15 will usher in the Lantern Festival, the Year of the Tiger Renyin.

Surprisingly, the Lantern Festival in the Year of the Tiger is not "15 rounds" nor "16 rounds", but "17 rounds", and the roundest moment occurs at 0:56 on February 17.

  Lin Yuan, a member of the Chinese Astronomical Society and an expert on astronomy science in Tianjin, introduced that on the first day of the lunar calendar, the moon travels between the earth and the sun. It is also called "Shuo"; around the fifteenth day of the lunar calendar, the bright side of the moon is all facing the earth, and we can see the round moon, called "full moon", also called "wang".

The length of the time interval from "Suo" to "Suo", or from "Wang" to "Wang" is called a "synodic month", with an average of 29.53059 days.

  Also on the first day of the lunar calendar, "Suo" may occur in the early morning, in the morning, in the afternoon, or in the evening, and each "syntactic month" itself has its own long and short.

In this way, the "look" at the fullest moment of the moon can occur at the earliest on the evening of the 14th lunar calendar, and at the latest on the morning of the 17th lunar calendar.

However, since "Shuo" must be on the first day of the lunar calendar, after "Shuo", it takes an average of 14 days, 18 hours and 22 minutes to be "wang", so the "wang" when the moon is at its fullest appears on the 15th and 15th of the lunar calendar. Sixteen are mostly these two days.

  Statistics show that the most frequent occurrence of "full moon" is on the 16th of the lunar calendar, followed by the 15th of the lunar calendar, again on the 17th of the lunar calendar, and the least on the 14th of the lunar calendar.

  "The '15 moon and 17 rounds' like this year's Lantern Festival is relatively rare. The last time it appeared was on February 26, 2013 (the 17th of the first month), and the next time will be on March 1, 2029 (the 10th of the first month). 7) Reappearance. But no matter when it is round, the moon that people see with the naked eye is basically the same, and the full moon is the same, which will not affect people's appreciation of the moon on the night of the Lantern Festival to express their feelings." Lin Yuan said.

  When is the best time to admire the moon on the night of the Lantern Festival?

Two hours after sunset is a good time to admire the moon.

"One is that the moon looks very big at this time; the other is that the moon has a beautiful silvery white color, which is pleasing to the eye; the third is that the moon's altitude is relatively low, which is suitable for taking beautiful photos of 'continuous moon and landscape'." Lin Yuan said , with the passage of time, the moon moves to the due south sky at midnight.

At this time, the height of the moon on the horizon reached the highest level in the whole night, and everything was silent.